﻿@model IEnumerable<shop.ThuongHieu>
          
              <select name="MaTH">
@foreach (var item in Model)
{
                  <optgroup label="@item.ThuongHieu1"></optgroup>
                  @Html.Action("dropthbycha", "Partial", new { idcha =item.IdCha})
}
              </select> 
               
           